topic Re: calculating wald confidence intervals? please help in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189004#M47778 <HTML><HEAD></HEAD><BODY><P>You haven't provided enough info. What proc are you using, what code, options?</P><P></P><P>If its survival analysis and you need WALD CI for hazard ratio you can use the CL=WARD option on the hazard ratio statement.</P></BODY></HTML> Sun, 08 Jun 2014 19:47:32 GMT Reeza 2014-06-08T19:47:32Z calculating wald confidence intervals? please help https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189002#M47776 <HTML><HEAD></HEAD><BODY><P><A href="http://i60.tinypic.com/2coppiw.png" title="http://i60.tinypic.com/2coppiw.png">http://i60.tinypic.com/2coppiw.png</A></P><P></P><P>Hiya, not sure how to calculate a confidence interval, particularly the standard error</P><P>My teacher said it's "exp(B1 + B4 +/- 1.96* sqrt(se(B1) + se(B4) + 2cov(B1,B4) )"</P><P>where B1 is the factor and B4 is the interaction term (estimates).</P><P>xxx</P></BODY></HTML> Sun, 08 Jun 2014 14:31:56 GMT https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189002#M47776 katiexyz 2014-06-08T14:31:56Z Re: calculating wald confidence intervals? please help https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189003#M47777 <HTML><HEAD></HEAD><BODY><P>obviously i think she's wrong! otherwise i wouldn't be on here... xx</P></BODY></HTML> Sun, 08 Jun 2014 14:33:38 GMT https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189003#M47777 katiexyz 2014-06-08T14:33:38Z Re: calculating wald confidence intervals? please help https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189004#M47778 <HTML><HEAD></HEAD><BODY><P>You haven't provided enough info. What proc are you using, what code, options?</P><P></P><P>If its survival analysis and you need WALD CI for hazard ratio you can use the CL=WARD option on the hazard ratio statement.</P></BODY></HTML> Sun, 08 Jun 2014 19:47:32 GMT https://communities.sas.com/t5/SAS-Procedures/calculating-wald-confidence-intervals-please-help/m-p/189004#M47778 Reeza 2014-06-08T19:47:32Z